<template>
    <!-- 底部 -->
    <div class="my-footer">
        <!-- 全选 -->
        <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="footerCheck" v-model="isAll">
            <label class="custom-control-label" for="footerCheck">全选</label>
        </div>
        <!-- 合计 -->
        <div>
            <span>合计:</span>
            <span class="price">¥ {{ allPrice }}</span>
        </div>
        <!-- 按钮 -->
        <button type="button" class="footer-btn btn btn-primary" background="red">结算 ( {{ allCount }} )</button>
    </div>
</template>
  
<script>
export default {

    props: {
        arr: Array
    },
    data() {
        return {

        }
    },
    computed: {
        isAll: {
            get() {
                return this.arr.every(item => item.good_state)
            },
            set(val) {
                //this.arr.forEach(item => item.good_state = val)
                this.$emit('changeAll', val)
            }
        },
        allCount() {
            return this.arr.reduce((sum, obj) => {
                if (obj.good_state) {
                    sum += obj.count
                }
                return sum;
            }, 0)
        },
        allPrice (){
            return this.arr.reduce((sum, obj) => {
                if (obj.good_state) {
                    sum += obj.price * obj.count
                }
                return sum;
            }, 0)
        }
    },

}
</script>
  
<style lang="less" scoped>
.my-footer {
    position: fixed;
    z-index: 2;
    bottom: 0;
    width: 100%;
    height: 50px;
    border-top: 1px solid #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    background: #fff;

    .price {
        color: red;
        font-weight: bold;
        font-size: 15px;
    }

    .footer-btn {
        min-width: 80px;
        height: 30px;
        line-height: 30px;
        border-radius: 25px;
        padding: 0;
    }
}
</style>